Winding drum structure of hot rolling medium-wide belt coil uncoiler

The utility model relates to a winding drum structure of a hot rolling medium-wide belt coil uncoiler, and belongs to the technical field of hot rolling medium-wide belt coil uncoilers in the metallurgical industry. According to the technical scheme, an uncoiler winding drum (1) is in a cylinder shape formed by combining four sector plates, each sector plate is connected with a pyramid sleeve (4) through an expansion pull rod (6), the pyramid sleeve (4) is fixed to an uncoiler winding drum main shaft (5), the two sides of each sector plate in the length direction are in a sawtooth shape formed by concave-convex structures, and the two sides of each sector plate are in a sawtooth shape. The concave-convex structures between every two adjacent sector plates are mutually embedded or separated; the first diameter-increasing plates (2) and the second diameter-increasing plates (3) are fan-shaped plates with different diameters, and the four first diameter-increasing plates (2) and the four second diameter-increasi